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Re: Mast "pumping" (not under sail, at the dock).. ?
I just dealt with this issue on my boat, (discussed on another forum). You and I both have "telephone pole" rigs. Thick masts that are only made to have a tiny amount of pre-bend.
Snug up your forward lowers 1/2 turn each. Maybe 1 turn. If the aft lowers get tight when you do this, then loosen them a corresponding amount of turns.
Also, take your jib halyard over to a stbd stanchion base (just pick one) and mark exactly where it reaches the toe rail with a piece of tape. Take the halyard over to the same stanchion base on the port side. The halyard should reach the toe rail at the taped mark on the halyard. If it doesn't, then your mast is canted in one direction or the other, and you need to loosen everything and start over.
Get the mast centered directly over the boat.
S/V Old Shoes
1973 Pearson 30 #255